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03-15-2019, 06:19 AM
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#1
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Member
Join Date: Jul 2010
Posts: 31
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Hot Water
Recently I will turn on the water, a mix of hot and cold to get temp right. Then the water will pulse between hot and cold. First experienced it in the shower, then the bath sink, and then the kitchen. Most noticeable in the bathroom fixtures. Have an atwood gas/electric water heater. Using it in the electric mode. The water is plenty hot when it comes out. Just won't stay at temp selected. Keep pulsing from hot to cold, extreme change. Any thoughts??? 
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03-15-2019, 06:36 AM
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#2
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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...debris in the appliance mix valves could be the issue but more likely, most RV "hot" water heaters have a one-way check-valve that keeps hot water from backing/expanding into the cold water pipe....this valve often has plastic parts inside and is prone to failure---symptoms vary from fluctuations in temps to total loss of hot water.….depending on heater location and length of time value has been in place, replacement can be challenging....
__________________
Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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03-15-2019, 07:59 AM
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#3
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Senior Member
Join Date: Mar 2016
Location: Arizona
Posts: 1,134
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Before doing too much troubleshooting, make sure external shower controls are turned fully off.
__________________
2016 Fleetwood Bounder 33C. Towing 2017 Jeep Wrangler Unlimited.
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03-15-2019, 08:06 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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Quote:
Originally Posted by Elwood58
Before doing too much troubleshooting, make sure external shower controls are turned fully off.
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Yup. 
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03-15-2019, 04:22 PM
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#5
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,228
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Quote:
Originally Posted by Elwood58
Before doing too much troubleshooting, make sure external shower controls are turned fully off.
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Also if you have a mixing valve on the shower head itself, make sure it is off too.
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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03-18-2019, 07:42 AM
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#6
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Member
Join Date: Jul 2010
Posts: 31
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Still need some help on the hot water issue. Left the rally and returned to the resort in Foley Alabama and hooked up as usual with electric and CITY water. Cut the shower water on and hot and cold work fine. Works fine in the bath sink. We both took showers and worked fine. So, this only happened when using the pump. I had just replaced the pump before we left for the rally. Same pump, and there’s not much room for a mistake hooking it up. Water supply in and out. Two wires, and all hooked up just as the previous pump. Somebody help, I have no idea how the pump could cause a problem with the hot and cold water mix.
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Linear Mode
